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bpf: Bump iter seq size to support BTF representation of large data structures

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BPF iter size is limited to PAGE_SIZE; if we wish to display BTF-based
representations of larger kernel data structures such as task_struct,
this will be insufficient.

Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1601292670-1616-6-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2020-09-28 12:31:07 +01:00 committed by Alexei Starovoitov
parent 076a95f5af
commit af65320948
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/bpf_iter.c
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@ -88,8 +88,8 @@ static ssize_t bpf_seq_read(struct file *file, char __user *buf, size_t size,
mutex_lock(&seq->lock);
if (!seq->buf) {
seq->size = PAGE_SIZE;
seq->buf = kmalloc(seq->size, GFP_KERNEL);
seq->size = PAGE_SIZE << 3;
seq->buf = kvmalloc(seq->size, GFP_KERNEL);
if (!seq->buf) {
err = -ENOMEM;
goto done;